Admittedly, I have concerns about heat and silicone. The two do not appear to be good bedfellows. However, I haven't yet experienced a problem. Luckily for me, E420 included the color of bowl that was similar to the color of my bong. That was not apparent when I made aware that it would be a freebie. Good job. This is what it looks like attached to the bong (w/flower).